namespace Npgsql.EntityFrameworkCore.PostgreSQL.Query.ExpressionTranslators.Internal;

/// <summary>
///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
///     the same compatibility standards as public APIs. It may be changed or removed without notice in
///     any release. You should only use it directly in your code with extreme caution and knowing that
///     doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public class NpgsqlRandomTranslator : IMethodCallTranslator
{
    private static readonly MethodInfo _methodInfo
        = typeof(DbFunctionsExtensions).GetRuntimeMethod(nameof(DbFunctionsExtensions.Random), [typeof(DbFunctions)])!;

    private readonly ISqlExpressionFactory _sqlExpressionFactory;

    /// <summary>
    ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
    ///     the same compatibility standards as public APIs. It may be changed or removed without notice in
    ///     any release. You should only use it directly in your code with extreme caution and knowing that
    ///     doing so can result in application failures when updating to a new Entity Framework Core release.
    /// </summary>
    public NpgsqlRandomTranslator(ISqlExpressionFactory sqlExpressionFactory)
    {
        _sqlExpressionFactory = sqlExpressionFactory;
    }

    /// <summary>
    ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
    ///     the same compatibility standards as public APIs. It may be changed or removed without notice in
    ///     any release. You should only use it directly in your code with extreme caution and knowing that
    ///     doing so can result in application failures when updating to a new Entity Framework Core release.
    /// </summary>
    public virtual SqlExpression? Translate(
        SqlExpression? instance,
        MethodInfo method,
        IReadOnlyList<SqlExpression> arguments,
        IDiagnosticsLogger<DbLoggerCategory.Query> logger)
    {
        Check.NotNull(method, nameof(method));
        Check.NotNull(arguments, nameof(arguments));
        Check.NotNull(logger, nameof(logger));

        return _methodInfo.Equals(method)
            ? _sqlExpressionFactory.Function(
                "random",
                [],
                nullable: false,
                argumentsPropagateNullability: [],
                method.ReturnType)
            : null;
    }
}
